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研究了用流动注射分析(FIA)进行双波长标准加入法同时测定铁和铝的新方法.方法基于在溴化十六烷基三甲胺存在下,络天青S与铁和铝在同一酸度(pH 6.75)均有灵敏的显色反应,但两配合物的吸收光谱互相重叠.在优化的试验条件下,铁和铝检出限分别为0.001和0.002μg·ml~(-1),铁浓度在0～1.2μg·ml~(-1)、铝浓度在0～0.8μg·ml~(-1)时服从比耳定律,测样频率为60样·h~(-1),所拟方法用于实际样品分析,结果良好.
A new method for the simultaneous determination of Fe and Al by flow injection analysis (FIA) was developed.METHODS A new method for simultaneous determination of iron and aluminum by flow injection analysis (FIA) was developed.Methods A new method was developed for the determination of iron and aluminum in the presence of cetyltrimethylammonium bromide pH 6.75), but the absorption spectra of the two complexes overlapped.The detection limits of iron and aluminum were 0.001 and 0.002μg · ml -1, respectively, and the iron concentration Beer’s law was obeyed at 0 ~ 1.2μg · ml ~ (-1) and aluminum concentration was 0 ~ 0.8μg · ml ~ (-1), and the sampling frequency was 60 samples · h ~ (-1) For the actual sample analysis, the result is good.